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NFC: netlink: SE API implementation 

Implementation of the NFC_CMD_SE_IO command for sending ISO7816 APDUs to
NFC embedded secure elements. The reply is forwarded to user space
through NFC_CMD_SE_IO as well.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2013-08-28 00:47:24 +02:00
parent 72b70b6ec4
commit 5ce3f32b52
1 changed files with 91 additions and 0 deletions
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91
net/nfc/netlink.c
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@ -58,6 +58,7 @@ static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
[NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
[NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
.len = NFC_FIRMWARE_NAME_MAXSIZE },
[NFC_ATTR_SE_APDU] = { .type = NLA_BINARY },
};
static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
@ -1278,6 +1279,91 @@ static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
return 0;
}
struct se_io_ctx {
u32 dev_idx;
u32 se_idx;
};
void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
{
struct se_io_ctx *ctx = context;
struct sk_buff *msg;
void *hdr;
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!msg) {
kfree(ctx);
return;
}
hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
NFC_CMD_SE_IO);
if (!hdr)
goto free_msg;
if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
goto nla_put_failure;
genlmsg_end(msg, hdr);
genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
kfree(ctx);
return;
nla_put_failure:
genlmsg_cancel(msg, hdr);
free_msg:
nlmsg_free(msg);
kfree(ctx);
return;
}
static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
{
struct nfc_dev *dev;
struct se_io_ctx *ctx;
u32 dev_idx, se_idx;
u8 *apdu;
size_t apdu_len;
if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
!info->attrs[NFC_ATTR_SE_INDEX] ||
!info->attrs[NFC_ATTR_SE_APDU])
return -EINVAL;
dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
dev = nfc_get_device(dev_idx);
if (!dev)
return -ENODEV;
if (!dev->ops || !dev->ops->se_io)
return -ENOTSUPP;
apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
if (apdu_len == 0)
return -EINVAL;
apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
if (!apdu)
return -EINVAL;
ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->dev_idx = dev_idx;
ctx->se_idx = se_idx;
return dev->ops->se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
}
static struct genl_ops nfc_genl_ops[] = {
{
.cmd = NFC_CMD_GET_DEVICE,
@ -1358,6 +1444,11 @@ static struct genl_ops nfc_genl_ops[] = {
.done = nfc_genl_dump_ses_done,
.policy = nfc_genl_policy,
},
{
.cmd = NFC_CMD_SE_IO,
.doit = nfc_genl_se_io,
.policy = nfc_genl_policy,
},
};